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<!DOCTYPE html>
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<h1>Piecewise linear fit coder factory.</h1>
<small class="dont-index">Source: <a href="https://github.com/WinVector/RcppDynProg/blob/HEAD/R/vtreat_coders.R" class="external-link"><code>R/vtreat_coders.R</code></a></small>
<div class="hidden name"><code>piecewise_linear_coder.Rd</code></div>
</div>
<div class="ref-description">
<p>Build a piecewise linear fit coder with some parameters bound in.</p>
</div>
<div id="ref-usage">
<div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">piecewise_linear_coder</span><span class="op">(</span></span>
<span> penalty <span class="op">=</span> <span class="fl">1</span>,</span>
<span> min_n_to_chunk <span class="op">=</span> <span class="fl">1000</span>,</span>
<span> min_seg <span class="op">=</span> <span class="fl">10</span>,</span>
<span> max_k <span class="op">=</span> <span class="fl">1000</span></span>
<span><span class="op">)</span></span></code></pre></div>
</div>
<div id="arguments">
<h2>Arguments</h2>
<dl><dt>penalty</dt>
<dd><p>per-segment cost penalty.</p></dd>
<dt>min_n_to_chunk</dt>
<dd><p>minimum n to subdivied problem.</p></dd>
<dt>min_seg</dt>
<dd><p>positive integer, minimum segment size.</p></dd>
<dt>max_k</dt>
<dd><p>maximum segments to divide into.</p></dd>
</dl></div>
<div id="value">
<h2>Value</h2>
<p>a vtreat coder</p>
</div>
<div id="ref-examples">
<h2>Examples</h2>
<div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span></span></span>
<span class="r-in"><span><span class="va">coder</span> <span class="op"><-</span> <span class="fu">piecewise_linear_coder</span><span class="op">(</span>min_seg <span class="op">=</span> <span class="fl">1</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="fu">coder</span><span class="op">(</span><span class="st">"x"</span>, <span class="fl">1</span><span class="op">:</span><span class="fl">8</span>, <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="fl">1</span>, <span class="fl">2</span>, <span class="fl">3</span>, <span class="fl">4</span>, <span class="fl">4</span>, <span class="fl">3</span>, <span class="fl">2</span>, <span class="fl">1</span><span class="op">)</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> [1] 1 2 3 4 4 3 2 1</span>
<span class="r-out co"><span class="r-pr">#></span> attr(,"approx_table")</span>
<span class="r-out co"><span class="r-pr">#></span> predXs predYs</span>
<span class="r-out co"><span class="r-pr">#></span> 1 1 1</span>
<span class="r-out co"><span class="r-pr">#></span> 2 4 4</span>
<span class="r-out co"><span class="r-pr">#></span> 3 5 4</span>
<span class="r-out co"><span class="r-pr">#></span> 4 8 1</span>
<span class="r-out co"><span class="r-pr">#></span> attr(,"method")</span>
<span class="r-out co"><span class="r-pr">#></span> [1] "linear"</span>
<span class="r-in"><span></span></span>
</code></pre></div>
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